const express = require('express');
const app = express();

// 定义中间件
const middleware1 = (req,res,next) => {
  console.log('1');
  next();
  console.log('1-1');
}
const middleware2 = (req,res,next) => {
  console.log('2');
  next();
  console.log('2-2');
}
const middleware3 = (req,res,next) => {
  console.log('3');
  next();
  console.log('3-3');
}
app.use(middleware1)
app.use(middleware2)
app.use(middleware3)


app.get('/home', (req,res)=> {
  res.send('home')
})
app.listen(3000, () => {
  console.log('start at port 3000');
})